313243531 has 2 divisors, whose sum is σ = 313243532. Its totient is φ = 313243530.

The previous prime is 313243501. The next prime is 313243537. The reversal of 313243531 is 135342313.

It is a strong prime.

It is an emirp because it is prime and its reverse (135342313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313243531 - 2¹³ = 313235339 is a prime.

It is a super-2 number, since 2×313243531² = 196243019426695922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 313243496 and 313243505.

It is not a weakly prime, because it can be changed into another prime (313243537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156621765 + 156621766.

It is an arithmetic number, because the mean of its divisors is an integer number (156621766).

Almost surely, 2^313243531 is an apocalyptic number.

313243531 is a deficient number, since it is larger than the sum of its proper divisors (1).

313243531 is an equidigital number, since it uses as much as digits as its factorization.

313243531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 25.

The square root of 313243531 is about 17698.6872677043. The cubic root of 313243531 is about 679.1421788370.

Adding to 313243531 its reverse (135342313), we get a palindrome (448585844).

The spelling of 313243531 in words is "three hundred thirteen million, two hundred forty-three thousand, five hundred thirty-one".